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# coding: utf-8
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"""test the IPython Kernel"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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import io
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import os.path
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import sys
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import nose.tools as nt
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from IPython.testing import decorators as dec, tools as tt
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from IPython.utils import py3compat
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from IPython.utils.path import locate_profile
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from IPython.utils.tempdir import TemporaryDirectory
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from .utils import (new_kernel, kernel, TIMEOUT, assemble_output, execute,
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flush_channels, wait_for_idle)
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def _check_mp_mode(kc, expected=False, stream="stdout"):
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execute(kc=kc, code="import sys")
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flush_channels(kc)
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msg_id, content = execute(kc=kc, code="print (sys.%s._check_mp_mode())" % stream)
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stdout, stderr = assemble_output(kc.iopub_channel)
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nt.assert_equal(eval(stdout.strip()), expected)
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# printing tests
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def test_simple_print():
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"""simple print statement in kernel"""
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with kernel() as kc:
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iopub = kc.iopub_channel
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msg_id, content = execute(kc=kc, code="print ('hi')")
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stdout, stderr = assemble_output(iopub)
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nt.assert_equal(stdout, 'hi\n')
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nt.assert_equal(stderr, '')
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_check_mp_mode(kc, expected=False)
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def test_sys_path():
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"""test that sys.path doesn't get messed up by default"""
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with kernel() as kc:
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msg_id, content = execute(kc=kc, code="import sys; print (repr(sys.path[0]))")
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stdout, stderr = assemble_output(kc.iopub_channel)
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nt.assert_equal(stdout, "''\n")
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def test_sys_path_profile_dir():
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"""test that sys.path doesn't get messed up when `--profile-dir` is specified"""
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with new_kernel(['--profile-dir', locate_profile('default')]) as kc:
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msg_id, content = execute(kc=kc, code="import sys; print (repr(sys.path[0]))")
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stdout, stderr = assemble_output(kc.iopub_channel)
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nt.assert_equal(stdout, "''\n")
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@dec.knownfailureif(sys.platform == 'win32', "subprocess prints fail on Windows")
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def test_subprocess_print():
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"""printing from forked mp.Process"""
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with new_kernel() as kc:
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iopub = kc.iopub_channel
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_check_mp_mode(kc, expected=False)
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flush_channels(kc)
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np = 5
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code = '\n'.join([
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"from __future__ import print_function",
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"import multiprocessing as mp",
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"pool = [mp.Process(target=print, args=('hello', i,)) for i in range(%i)]" % np,
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"for p in pool: p.start()",
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"for p in pool: p.join()"
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])
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expected = '\n'.join([
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"hello %s" % i for i in range(np)
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]) + '\n'
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msg_id, content = execute(kc=kc, code=code)
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stdout, stderr = assemble_output(iopub)
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nt.assert_equal(stdout.count("hello"), np, stdout)
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for n in range(np):
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nt.assert_equal(stdout.count(str(n)), 1, stdout)
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nt.assert_equal(stderr, '')
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_check_mp_mode(kc, expected=False)
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_check_mp_mode(kc, expected=False, stream="stderr")
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def test_subprocess_noprint():
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"""mp.Process without print doesn't trigger iostream mp_mode"""
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with kernel() as kc:
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iopub = kc.iopub_channel
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np = 5
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code = '\n'.join([
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"import multiprocessing as mp",
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"pool = [mp.Process(target=range, args=(i,)) for i in range(%i)]" % np,
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"for p in pool: p.start()",
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"for p in pool: p.join()"
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])
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msg_id, content = execute(kc=kc, code=code)
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stdout, stderr = assemble_output(iopub)
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nt.assert_equal(stdout, '')
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nt.assert_equal(stderr, '')
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_check_mp_mode(kc, expected=False)
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_check_mp_mode(kc, expected=False, stream="stderr")
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@dec.knownfailureif(sys.platform == 'win32', "subprocess prints fail on Windows")
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def test_subprocess_error():
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"""error in mp.Process doesn't crash"""
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with new_kernel() as kc:
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iopub = kc.iopub_channel
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code = '\n'.join([
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"import multiprocessing as mp",
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"p = mp.Process(target=int, args=('hi',))",
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"p.start()",
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"p.join()",
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])
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msg_id, content = execute(kc=kc, code=code)
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stdout, stderr = assemble_output(iopub)
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nt.assert_equal(stdout, '')
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nt.assert_true("ValueError" in stderr, stderr)
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_check_mp_mode(kc, expected=False)
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_check_mp_mode(kc, expected=False, stream="stderr")
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# raw_input tests
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def test_raw_input():
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"""test [raw_]input"""
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with kernel() as kc:
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iopub = kc.iopub_channel
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input_f = "input" if py3compat.PY3 else "raw_input"
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theprompt = "prompt> "
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code = 'print({input_f}("{theprompt}"))'.format(**locals())
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msg_id = kc.execute(code, allow_stdin=True)
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msg = kc.get_stdin_msg(block=True, timeout=TIMEOUT)
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nt.assert_equal(msg['header']['msg_type'], u'input_request')
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content = msg['content']
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nt.assert_equal(content['prompt'], theprompt)
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text = "some text"
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kc.input(text)
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reply = kc.get_shell_msg(block=True, timeout=TIMEOUT)
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nt.assert_equal(reply['content']['status'], 'ok')
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stdout, stderr = assemble_output(iopub)
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nt.assert_equal(stdout, text + "\n")
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@dec.skipif(py3compat.PY3)
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def test_eval_input():
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"""test input() on Python 2"""
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with kernel() as kc:
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iopub = kc.iopub_channel
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input_f = "input" if py3compat.PY3 else "raw_input"
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theprompt = "prompt> "
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code = 'print(input("{theprompt}"))'.format(**locals())
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msg_id = kc.execute(code, allow_stdin=True)
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msg = kc.get_stdin_msg(block=True, timeout=TIMEOUT)
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nt.assert_equal(msg['header']['msg_type'], u'input_request')
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content = msg['content']
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nt.assert_equal(content['prompt'], theprompt)
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kc.input("1+1")
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reply = kc.get_shell_msg(block=True, timeout=TIMEOUT)
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nt.assert_equal(reply['content']['status'], 'ok')
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stdout, stderr = assemble_output(iopub)
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nt.assert_equal(stdout, "2\n")
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def test_save_history():
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# Saving history from the kernel with %hist -f was failing because of
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# unicode problems on Python 2.
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with kernel() as kc, TemporaryDirectory() as td:
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file = os.path.join(td, 'hist.out')
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execute(u'a=1', kc=kc)
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wait_for_idle(kc)
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execute(u'b=u"abcþ"', kc=kc)
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wait_for_idle(kc)
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_, reply = execute("%hist -f " + file, kc=kc)
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nt.assert_equal(reply['status'], 'ok')
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with io.open(file, encoding='utf-8') as f:
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content = f.read()
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nt.assert_in(u'a=1', content)
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nt.assert_in(u'b=u"abcþ"', content)
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def test_help_output():
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"""ipython kernel --help-all works"""
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tt.help_all_output_test('kernel')
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def test_is_complete():
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with kernel() as kc:
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# There are more test cases for this in core - here we just check
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# that the kernel exposes the interface correctly.
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kc.is_complete('2+2')
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reply = kc.get_shell_msg(block=True, timeout=TIMEOUT)
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assert reply['content']['status'] == 'complete'
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# SyntaxError should mean it's complete
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kc.is_complete('raise = 2')
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reply = kc.get_shell_msg(block=True, timeout=TIMEOUT)
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assert reply['content']['status'] == 'invalid'
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kc.is_complete('a = [1,\n2,')
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reply = kc.get_shell_msg(block=True, timeout=TIMEOUT)
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assert reply['content']['status'] == 'incomplete'
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assert reply['content']['indent'] == ''
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def test_complete():
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with kernel() as kc:
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execute(u'a = 1', kc=kc)
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wait_for_idle(kc)
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cell = 'import IPython\nb = a.'
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kc.complete(cell)
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reply = kc.get_shell_msg(block=True, timeout=TIMEOUT)
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c = reply['content']
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nt.assert_equal(c['status'], 'ok')
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nt.assert_equal(c['cursor_start'], cell.find('a.'))
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nt.assert_equal(c['cursor_end'], cell.find('a.') + 2)
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matches = c['matches']
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nt.assert_greater(len(matches), 0)
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for match in matches:
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nt.assert_equal(match[:2], 'a.')
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